IR 05000271/1979002
| ML19274E241 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 02/02/1979 |
| From: | Caphton D, Tanya Smith NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML19274E240 | List: |
| References | |
| 50-271-79-02, 50-271-79-2, NUDOCS 7903210024 | |
| Download: ML19274E241 (6) | |
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U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT Region I Report No.
79-02 Docket No.
50-271 License No.
DPR-28 Priority Category C
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Licensee:
Vermont Yankee Nuclear Power Corporation 20 Turnpike Road Westborough, Massachusetts 01581 Facility Name:
Vermont Yankee Nuclear Power Station Inspection at:
Vernon, Vermont
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Inspectionconducteh:
January 15-18, 1979 Inspectors:
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L /t 3/A /79 T. H. Smi/th, Reactor Inspector date signed date signed g
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date signed
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Approved by:
MS I
D. L. CaphTod, Chief, Nuclear Support date signed Section No.1, RO&NS Branch Inspection Summary:
Inspection on January 15-18, 1979 (Report No. 50-271/79-02)
Areas Inspected:
Routine, unannounced inspection by a regional based inspector of the Containment Integrated Leak Test Report; local leak rate testing; licensee action on previous inspection findings; IE Circular followup; and onsite LER followup.
The inspection involved 21 inspector-hours on site by one NRC regional based inspector.
Resul ts: No items of noncompliance were identified.
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7903210024 Region I Form 12 (Rev. April 77)
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DETAILS 1.
Persons Contacted
- R. Burke, Engineering Support Supervisor
- W. Conway, Plant Superintendent
- H. Eichenholz, Technical Assistant
- D. Girroir, Engineering Assistant
- W. Murphy, Assistant Plant Superintendent J. Pelletier, Maintenance Supervisor The inspector also talked with and interviewed members of the engineering and operating staffs.
- denotes those present at the exit interview.
2.
Licensee Action on Previous Inspection Findings (Closed) Unresolved Item (271/78-14-03): A license 3's represen-tative has stated that measured MSIV leakage will ba conservatively converted from a test pressure of 24 psig to equivalent 44 psig (Pa) leakage.
The conversion will be made using the square root of the ratio of the two pressures.
The equivalent 44 psig leakage will then be added to other Type B and C test results for compari-son with the 0.6 La acceptance criteria.
This item is resolved.
(Closed) Unresolved Item (271/78-16-04):
During the September 15 to October 13, 1978 refueling outage the leaking Primary Contain-ment Atmosphere Compressor System check valves (CA 968 and C) were repaired and locally leak tested with satisfactory results. Admin-istrative controls, which had been imposed to i mlate CA 96B and C to maintain containment integrity, were no longer required and were removed.
This item is resolved.
(Closed) Unresolved Item (271/78-16-05):
Subject print, Gl91160 Sheet 2, has been corrected by Revision 9 which is in the process of being distributed.
This item is resolve.
(0 pen) Unresolved Item (271/78-16-03): A licensee's representative stated to the inspector that based on the corrective action plan, as stated in the Vermont Yankee Primary Containment Leak Rate Testing report dated November 17, 1978, a Type A test is not Planned for the next refueling outage.
The inspector stated that after two consecutive periodic Type A test failuresSection III.A.6.(b)
of Appendix J requires that a Type A test be perfonned at each refueling outage or approximately every 18 months until two consecutive tests meet the acceptance criteria.
The inspector also stated that the implementation of a corrective action plan to correct previous test deficiencies does not affect the retest requirements of
'ppendix J.
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3.
Containment Integrated Leak Rate Test (CILRT)
a.
General The following documents and procedures were reviewed by the inspector.
" Primary Containment Leak Rate Testing" report dated
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November 17, 1978 OP 4030, Revision 3, DI 78-15, " Primary Containtnent Leak
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Rate" dated August 4,1978 CILRT Test Coordinator's Log, 1978 test section
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The above references were reviewed for accurate data trans-cription, proper instrument calibration, proper implementation of procedural changes, correctness of the analytical methods, and the accurate recording of significant events during the test.
No items of noncompliance were identified.
b.
Satisfactory CILRT Using raw data, the inspector computed several containment mass values and compared them to those calculated by the licensee.
Since the values of mass calculated by the licensee were in agreement with those calculated by the inspector, the inspector used the licensee calculated mass values and inde-pendently calculated the containment leak rate.
The test ra-sults are presented in Table 1.
The inspector's independent leak rate calculations confirm the licensee's reports of a successful CILR.
The inspector noted that at the conclusion of the CILRT 853 gallons of water was pumped from the drywell equipment sump and floor drain sump. A leak rate correction of 0.043 weight percent per day must be added to the CILRT results to compensate for the decreased containment volume due to the increased water level.
The inspector had no further questions concerning the CILRT at this time.
4.
General The following documents and procedures were reviewed by the inspector.
" Primary Containment Leak Rate Testing" report dated
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November 17, 1978 OP 4030, Revision 3, " Primary Containnent Leak Rate"
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dated December 14, 1978 OP 4030, Revision 2, DI 77-6, " Primary Containment Leak
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Rate" dated July 28, 1977 OP 4030, Revision 2, DI 76-2, Primary Containment Leak
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Rate" dated June 18, 1976 The above references were reviewed for accurate data trans-cription, proper instrument calibration, proper venting and draining of the system under test, and proper test direction.
On a sampling basis, the inspector also verified local leak rate calculations for the various test methods employed.
The inspector had no further questions in this area.
5.
IE Circular Followup IE Circular 77-11, " Leakage of Containment Isolation Valves with Resilient Seats", was reviewed on site.
The inspector reviewed facility records and interviewed licensee personnel to verify that licensee management forwarded the circular to appropriate personnel, a review for applicability was performed and corrective action was taken as required. The inspector had no further questions in this are.
On Site Licensee Event Followup Licensee Event Report R0 78-25/3L, Revision 1, was reviewed by the inspector on site.
The inspector verified that reporting requirements of the technical specifications had been met, that appropriate corrective action had been taken and that continued operation of the facility was conducted in accordance with the technical specifications.
The inspector had no further questions in this area.
7.
Exit Interview At the inspection's end the inspector held a meeting (see Detail 1 for attendees) to discuss the inspection scope and findings.
No items of noncompliance were identified and there were no un-resolved item.
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Table 1 August 1978 - CILRT Conducted at Pa (44 psig)
at Vermont Yankee Item Acceptance Criteria Reported Results Inspector's Findings 1.
CILRT Leak Rate by
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.277%/ day
.277%/ day Mass Point Technique 2.
Upper 95% Confidence
.75 La =.6%/ day
.281%/ day
.324%/ day *
Level on Leak Rate 3.
Supplemental Verifi-25% La = 142 lbm 21.9 lbn 23.9 lbm cation Test Difference includes 0.043%/ day addition for water level increase in drywell equipment
and floor drain sumps.
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